For a limited period the BBC News Website is experimenting with clickable links within the body of news stories.
If you click on one of these links, a window will appear containing background material relevant to that word that is highlighted. The links have been carefully chosen by our journalists.
We are doing this trial because we want to see if you enjoy exploring background material presented in this way. It's part of our continuing efforts to provide the best possible experience.
In addition to background material from the BBC News website, we are also displaying content from other sites, including Wikipedia, You Tube and Flickr. We have done this to find out what you think about us offering you related material from other sources.
If you take part in the trial, we hope you find it useful and we would like to hear what you think. You can send us your feedback via the "What's this?" link which can be found at the bottom of the pop-up window.
The system that we are using for this trial is provided by Apture.